First of all, thank you for downloading my model :D
So you will need T-Nuts Mounting System made by @6d6178.
When you got the t-nuts printed with or without optional adapters you need to slot the screws into holes and then loosely screw M2/M2,5 screws (i used m2,5x20 but you can do it with shorter ones).
Then you just slot in the contraption and screw it in (you will need longer screwdriver/hex wrench and bit type screwdriver won't work as its too wide).
The author marked this model as their own original creation.