No support is needed, I modified the model that way, increased the size of the magnet holder, the original one was too small. I made a model for 6x3mm, 8x3mm, and 10x3mm magnets, I recommend the 10mm magnet, itholdswell!
Update:
Left side cover, updated I also cut off the corner a little to make it the same! The update version for the print profiles!