Electrical box for double and triple Loxone Mounting Bracket

Double and triple Loxone Mounting Brackets (https://shop.loxone.com/enen/mounting-bracket-double-silver.html, https://shop.loxone.com/enen/triple-mounting-bracket-silver.html) have non-standard box spacing of 98 mm. Installing three classical boxes precisely can be a chore, so I modeled this box which can be used right away.

I provided two depths - 60 and 40 mm.

EDIT 2023-10-15: Added extension for triple bracket, because (as always) contractors sunk the box in the wall too deep.