Grounding the Basebox5

Hardware MikroTik hardware general
1

Hello;
Can anybody please tell me how can I correctly ground the BaseBox5? When I open the bottom door there is a hole marked as grounding point, but I have no idea how I should use it! (Should I open the outdoor box to access the grounding point? if yes, the how, it seems to be sealed)
I’m really confused on this…

Thanks in advance for any helps or suggestion.

2

There are two screws, they are hidden behind two grey stickers. Remove stickers, undo screws, and board will slide out.

Grounding wire should be attached to one of the holes in board corners.