(macro)Quantum phasing/tunneling is a scary but necessary trait for the bumblebee species so the only way to be safe is to keep thick enough glass panels that the chance becomes as close to zero as is comfortable for you. I use 20 mm glass panels at home due to bad experiences, but your preference may vary

Those are probably carpenter bees, not bumblebees. They look very similar. Carpenter bees are motherfuckers that drill 1/2" holes into deck posts and other wooden surfaces. Might want to get some traps.