Product review (2 stars): "Will Not Crack" But Arrives Broken?
The seller says the pan will not crack, but the very first review is from a customer whose pan arrived broken.  Amazon promptly replaced the broken pan, but that does not bode well for the future of the replacement pan.  In my experience as a hardwood floorwright who repairs a lot of water-damaged wood floors, even supple plastics become brittle under an appliance that generates heat, like a dishwasher or a clothes washer.  I am only aware of one truly unbreakable dishwasher leak pan on the market. It is made in the US, not China, (see Eastman product details.)  As for the 3-sided design, as opposed to a 4-sided pan.  I understand. The designer's thinking, however, is that a property owner wants to catch a leak early and does not want to be oblivious to water pooling under an appliance.  Eventually, a 4-sided pan will overflow, and a greater volume of water at that later stage awaits to spill upon removal.  For people who have to have 4 sides, it would be my strong recommendation that you also invest in an automatic water shut off device installed professionally.  In addition, unlike a 3-sided pan, the front side of a 4-sided pan will be visible, it will extend beyond the toe plate of your dishwasher, most likely.  Furthermore, while wiring and plumbing are often routed through the side of an appliance space, or back in to the wall, it is very common to find installations with the wiring and/or plumbing coming in to the space through the floor.  This, of course, will require some re-configuration.  If that is not an option, then a dishwasher leak pan is not, either.  It really makes no sense to be drilling through the plastic pan, in my opinion.  Some preliminary inspection to determine the route of your existing wiring and plumbing might be good form prior to ordering.  And finally, (another inspection note,) even though dishwasher leak pans are typically only 1/8" thick, be sure you have the height clearance that will allow both the pan and the appliance to fit beneath your counter top.  Leak pans are very cheap insurance, even a quality one that might cost a little more.  If there is any way you can overcome challenges and get a pan under your dishwasher, it is my strong recommendation that you do so.