My coffee filters seem to work pretty good, so far. Makes drying easy, fold up well to dump the last little bit into the bowl, or if I’ve grabbed too much, back into the tin/jar. Kinda spendy, though, at like $0.003/ea. I get over that by reusing them numerous times before discarding.
I’ve seen those tray’s shown on Instagram and maybe Reddit. I think they look very nice, but probably wouldn’t splurge. I too normally use a paper plate or paper towel. I’d enjoy a small leather mat or small wooden block, even if I only really used them for vanity pictures carefully curated for positing.