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Using GPR in this spot would be impossible now.
Those seem highly at risk of the cover falling into the hole.
the raised glyphs used for the anti-slip surface is the manufacturer’s logo, that kinda looks like a stealth bomber.
https://www.fonderiebelli.it/it/vendita/norocking-d400-4055.htm
For all the romaboos around, they also make one with SPQR letters (only visible on the initial page)