Battery disconnect switch fasteners

I'm likely to want to replace the original battery disconnect switch on a 2020 320S, with the same type, in the same location. (Front storage box on the diamond plate panel) I can see that the original is held in place with the typical nucamp square head screws. Does anyone know if they are just wood screws into blocking, or are they bolts to inaccessible nuts? Is this likely to be an easy swap?  I've got a stack of batteries in the way, so I'd like as much info as possible before I start digging into this. Thanks!