The positive wire for both glove box light and boot light should be same. You can tap positive line from dome light t3/2 (red/black wire) or also from footwell light positive wire. Later will be easier to tap.
The ground wire connection for glovebox light and boot light are different.
Glovebox ground wire
connect to any nearby ground point.Boot light ground wire should be connected to boot lock ground wire. There is a beige colour t5 connector behind left tail light. Have a look, usually t5/3 wire (violet/purple) is where we need to connect boot light ground wire. Verify before splicing the wire or take a picture and post here.
Don't touch any wires of BCM
That would be a dangerous territory.