ᐅ Mounting a Ubiquiti access point on the ceiling (without an in-wall box)

Hello,

I am currently facing the challenge of mounting my access point on the ceiling. Unfortunately, I didn’t consider having a flush-mounted box there. The cable cannot—and I don’t want to—be squeezed into the small space inside the access point. Does anyone have a good solution? Would it be possible to install a flush-mounted box afterwards using core drilling (if that’s even feasible)? Thanks in advance for your help!