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I guess it might be obvious from the photos but this doesn't have a flat surface suitable for a bottomless/naked portafilter. Had the tamper crater been directly behind the standard portafilter position it would have been ideal. I can't image why they put it where they did given that the area behind the tamper crater is unusable.
We have a Breville espresso machine and this works really well with it. It's thick silicon, so it's not flimsy at all. It not only works nicely as a tamp mat, but it also does a nice job containing the coffee grounds - makes cleanup a breeze. I would recommend this if your espresso machine is close to the edge of the counter.
The silicone mat is great. It fits on the flat side of my granite counter right in front my my espresso machine. It has helped get all the grounds out of my grinder cup (from the Niche Zero) into the portafilter when I can tap it on the mat so it is sturdy but won't cause any damage since the silicone is soft. the built in rest is great to get consistent tamps.
I do not have a naked portafilter so I do not know how this mat would work with that, but it is great for my normal 58 mm double portafilter.