Unfortunately it's trial and error, so start with a couple of cheapies to get a feel for what you might like.
This statement is very true, and even the most impressive mat on a certain TT in a certain set up, does not transfer the impression onto another TT in use in the same set up.
Take this mat to another TT in a completely different environment and the idea of replicating the good impression gets even more remote.
I would suggest prior to trialling Platter Mats, the method used as the under TT supporting structure is where the most beneficial discoveries can be made.
When this is correct for the environment the TT is residing in, it is going to be most beneficial to get the best outcome from any follow up investigations of other supporting ancillaries for the TT's usage.
I don't use TT's today that have the type of overall weight of the RX 5000, but when I had the TT in use that was seated in Granite and weighing in at 9 Stone, I found that a few Sub Plinth tiers separated by 'used squash balls cut in half' were able to produce a SQ that was improved over a support that was not with the added tiers.
The good news is that this is reasonably cheap to try out as first investigation.
I have a history of trying Plinth and Sub Plinth Materials and have been through many options for footers.
Today I use more complex footers on the Sub Plinth Tiers and am becoming quite confident in my suggestion that densified wood is offering one of the best performances I have encountered as a Plinth and Sub Plinth Material.
Recent investigations are showing there is a noticeable change for the better when the latest methods for a sub plinth assembly is used under a CDP as well.
It is in such a case as this, 'each to their own'. It all depends how early investigations impress, and how far the investigations will take a person. In my case they have not waned, running parallel with my HiFi experiences for over 20 years.
In that time I have lived in three different properties with different exposure levels to the impact of ambient transferral of energies.