Laser engraver hold (blocks) layer

the problem was to hold the surface to be engraved with the laser.
a solution I made of clips that engage the 20x20 edges. With a simple threaded rod from M5 and an M5 bolt.
The photo is of version 1, now the bolt is included in the base. For those like me who are struggling to find the right angle, there is also the 90 ° corner version.
Ciao