I bought 6 of these and put them under my cushions and they only worked for a couple of weeks.

This is a DIY solution… not suited for point & click cushion counters looking for a miracle fix without first following the 3 steps. No, it won’t work by placing under the cushions.  Any boost you might get will be short lived.  This solution requires studying the photos, reading and measuring to evaluate your situation before you order. If you just want something to throw under your cushions there are other products for that. This product is used solely for compressing the remaining foam density inside your cushion covers to delay buying new furniture.