Carpet slippage resolved

I thought I had tried everything to stop my fitted caravan carpets from creeping. Applying non-slip carpet tape reduced the creep but the carpet still kept buckling up / creeping under the door to the loo, Even more annoying was the slippage of the mats we bought to protect the carpets. We were re-positioning them every half an hour. 

Last week I googled and found a product on Amazon that came with excellent reviews. It's a spray-on application that dries overnight. Yesterday I applied it to two house mats that are forever creeping on our lounge and dining room carpets, and it is amazing. 

I have just treated the caravan carpets and mats, and tomorrow will treat the huge hall rug - it is so heavy it is a real pain to re-position it every few months - you have to roll it up, move it, unroll it and hope it unrolls in line with the walls and furniture. 

Apparently it works on bath / toilet seat mats, which you can machine wash three times before having to reapply.  

How come this product is not available in the shops - we can't be the only ones with this problem? I just hope there isn't a catch. 

I don't want to appear as if I am plugging someting for commercial gain, so won't mention the product. Google and read the Amazon reviews. Only reviews from purchasers appear.