We didn't test this, but I believe someone who had 1.1 did it and reported some reasonable temperature drop on the nvme drive under the case, although this requires quite a thick thermal pad - the M.2 takes reserves about 5.2mm under the motherboard but obviously the drive doesn't come right to the edge of this space and we have 8mm tall standoffs so you need to cover more than 3mm of space with the thermal pad or more than 2mm depending on the location of the M.2, in both cases this is a pretty thick thermal pad we're talking about.
Well, if asrock could:
lol