Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: If it's so heavy that it needs to be mounted on studs, how many mounting positions are possible?  Can it be centered in a wall?
Document: This is a great medicine chest. You need a drill, some good drywall anchors, a level, a studfinder, and a screwdriver to install it. I managed to install it on my own. The installation hardware isn't pre-drilled so you can easily drill the aluminum support bar so that you are mounting to the studs in your wall. Kohler did a really great job with the design of this piece, it's nearly perfect, right down to the packaging.
I have it mounted on the wall. It gives the bathroom a whole new look--clean, bright, classic! Lots of storage.I like the glass shelves, but make sure you get them where you want; they were hard to get in, so I imagine they are hard to take out. (At least I don't have to worry about them falling out)!Mounting it is a two person job unless you are an expert
We paid around $366, for this medicine cabinet so not cheap. The surface mount is so poorly designed, that we ended up boring a hole in the side trim with a 2" screw just to keep it on the wall. The top mounting pieces are not possible without worrying that the darn thing will come off the wall and break everything below it! Can't believe Kohler would even THINK that a half way intelligent person would consider even attempting to use these parts.
Love all the mirrored surfaces, especially for a surface mounted application. Expensive to reframe wall for such a large cabinet.Grey plastic bits on inside visble around hindges.
We had the larger one in our master bath redec. When you open the door, that part is also mirrored. It looks great and is very versatile. The one in MB is wall mounted. This new one will be inset. Mirrors all over, inside and out. Couldn't be happier with this product innovation.
I read a lot of reviews when before purchasing and saw many earlier reviewers had issues with plastic hinges but the recent specs indicated they are now metal. I purchased and am very happy with the cabinet. The only plastic parts are the mirror-mounted door frames and the clips that hold the glass shelves. Everything else is sturdy metal or glass. The cabinet has mirrors inside and out and looks great. Maybe I'm biased because my old cabinet was small and chopped up, but this cabinet has tons of space.
Purchased to replace a smaller recessed unit. Had to cut a couple studs and frame with 2x3's. Ensure doors are removed to install cabinet level and your done. No divider inside like the big box stores. Very good quality for the  money.
This is to replace an existing recess-mounted cabinet. Not sure if it's designed this way or my contractor is too inept/lazy to deepen the existing hole, the plastic sides are exposed by ~1&#34; instead of completely recessed. But from the front and inside of the cabinet look good.
I've been using one for a couple of months, and like the size and appearance. My only disappointment with Kohler is the overuse of plastic parts, e.g. the left and right mirrors are mounted/glued to in plastic frames. Given the reputation of the company, I'd think the quality of the materials would be a little higher.
Overall a very good medicine cabinet. Had no trouble installing it and it looked very nice recessed in the wall. The aluminum body of the cabinet was actually marked Robern, which costs way more than Kohler. The only problem was that after a few years of regular use the hinges started showing rust through the plating. It would be nice if Kohler could address this problem.
Answer: It is suggested to mount it on studs but it is not really that heavy.   I like to hit at least one stud.   It can be mounted in any different ways and it can be centered.