Are you a vinyl guy? It does help with vibration control, and cleaning.
Yes you can make your own, yes they will work great. I make W, Ms
then a flat piece for the bass. The flat is siliconed to the M or W.
That is where the real dampening happens. Don't use glue, use silicone.
On the bottom of the flat you can use little silicone stick on feet (come on sheets). I use, MDF, or soft wood (fir, or pine) then paint..
Enjoy, making them, it's fun, no they don't have to cost 60-80.00 a pair, to work very well, friggin nuts...
Regards