Instruction: Answer the given question using the supporting document.

Input:
Question: Can I use it in an outlet that has only 1 single socket?
Document: I got this to eliminate the clutter in a wall socket. I was tired of all of the three prong outlets or the floor extensions.This does the trick... five outlets and all are three prong.It fits into the existing outlet and is perfect in fit and use.Others have noted the rating as being less than perfect.For me, not a current issue.
This works well, though I would have preferred a screw to hold it in the socket. The outlet is tight, so plugs don't slip out, but I did pull the whole thing out of the socket fairly easily by accident.
Problem #1: This really needs a center screw. Whenever I unplug an item the surge protector comes unplugged as well.Problem #2: Right lower outlet does not and has not worked since purchased.Recommendation: Belkin SurgePlus, it has 6 outlets instead of 5, a screw to secure the protector and a bonus of 2 USB ports.
I received my Tripp Lite SK5TEL-0 surge today. I used it in my kitchen on a GFI outlet which only had 2 outlets. This was posing a problem for me as my Crazy English Mother-In-Law was always plugging in her fuggin tea kettle over my toaster.The plastic prong on the back which is supposed to go into the bottom socket failed to reach. I suspect this is b/c of the GFI socket being slightly larger. I simply broke it off and plugged it in.
I don't use DSL anymore, but it can be handy.Last point:  any guarantee or coverage warranty requires you have a FULL LINE COVERAGE under surge protectors. That means, there cannot be ANY unit ANYWHERE CONNECTED to the equipment, which is not covered by a surge protector (usually of that same manufacturer), or the warranty is INvalidated. So don't plug in your extension cords to the equipment, but then plug the extension itself into a bare wall outlet.
How they could leave out a mounting screw, I'll never know. The specs, size, and placement of outlets are great; except for the inability to secure the unit to the outlet. If using a DC block, just use a short jumper cord so that you don't have to worry about the weight pulling it out.
Purchased two of these for our living room. Love the fact that they are surge protectors as well. Someone else mentioned that when you unplug something from the surge protector that you need to hold the protector itself otherwise you will pull the whole thing out. That is a true statement as it does not screw into the socket. It does not bother me a bit, I still hold the ones that are screwed in as you probably should anyway.
I use several of these items and have not had any problems. These are really great for use in the kitchen, bathroom, or for multiple electronics (e.g. T.V., DVD, etc.)
Works as it should, is a good buy and they're very sturdy/rugged. Plugs fit nice and snug, the indicator lights are bright and easy to see... I don't use the phone protection jacks, but I'm sure they're fine, too. Would buy again (have 3).
Relatively slim considering it has 5 outlets. I use mine in a bath area where I need several items plugged in at the same time. I am careful that they are not all high wattage. (Electric toothbrush, electric cosmetic brush, cordless phone, etc. Love the surge protection as an added benefit. !
Answer: YES,it has a second plastic ground prong to help hold it in place with a double outlet and you can just clip or break it off and it will work fine in a single outlet.