PLDT H153 5G+ External Mod Quick Guide
Remove 2 screws at the bottom.
Carefully pry open the top cover, I forgot to mark them but it's the 6 rectangle slots in the inner part of the top.
These are the spots to connect the IPEX cables. If you want to completely remove the built in antennas you can remove the board here. I left mine inside.
I drilled holes, but you can let it hang through the exhaust and just tape it. Won't look as good though haha. Just remember to mark the cables with tape so you know where to pair them.