good isolation shelf for rega planar 2

Investigate Machina Dynamica Promethean Springs are extrremely cost effective. They would simply go between the TT and what ever shelf you use. Now, that shelf could make a sonic difference, but you can play with maple cutting baards, granite...

I would go with the Rega wall shelf and then experiment affordably with a thick Maple in conjunction with Sorbothane pucks between the Maple and the shelf and brass cones between the TT and the Maple.

dealer disclosure

I use inverted cones with my Rega 25. The wide part is on the table top with the points facing up. I use 3 cones and position them in the wood surround from below. Works very well.