Seed QR engraved in stainless steel plates

Just engraved some QR code templates in 1mm stainless steel plate.

Now I use a black ink permanent marker to create the code, afterwards I’ll punch a mark in each square .

Gonna engrave another one with some space for the actual seed words.

What do you guys think , is it the best option or you still prefer the washers ?

I use a Seedsigner as a HW wallet .