I see many people need to mount power strips inside their MAME cabs. While this method works well with power strips - it can be applied to anything that needs to be mounted like this. Building my house, I've used it to mount frames and bathroom fixtures.
Ok! So lets imagine your trying to mount everything inside your MAME cabinet and you need a power strip inside. Lets say this is your power strip:

Using a ruler or tape measure you could figure out where to put screws.... or.... you could use these tools:

It's a simple matter of applying tape to the power strip and marking the holes:

Now peel off the tape, and put the tape where you want to mount the power strip:

I hope this benefits someone. It's real simple and everyone I show it to seems to be surprised how easy it is and wonder why they've never thought of it.