Shower tray installation

[stevie12345]

Hi I appreciate similar questions have been asked before but I can't find an answer for this issue. I Am currently installing a shower tray. See below

http://www.pioneerbathrooms.com/permalife-1100mm-x-700mm-rectangular-low-profile-shower-tray.html

Supposedly it is made from another material than the usual stone resin and this is where my question arises. I want to raise it on legs to make room for waste etc and so have bought the matching riser kit

http://www.pioneerbathrooms.com/permalife-1100mm-x-700mm-rectangular-low-profile-shower-tray.html

This says to screw the feet directly to the tray. Having researched about stone resin trays it suggests they should be bedded on plywood and then have the feet attached as they more support to hold the weight. I appreciate the consensus is normally follow the manufacturers guidelines but I don't want to install the tray, do all the tiling and then drop something in it and it crack. Is this likely? Am I being overcautious? If plywood is the best option and then legs screwed to it should I attach the plyboard with silicon sealant or grip fill??

Any advice welcome

 

[Norcon]

A good strong marine plywood base is always the best option when raising the tray.
Then cement/sand with a dollop of unibond to mate the two.
You don't need the silly legs they make.