Hi looking for anyone to say yea its safe or any advice around the matter.

2 wires need to come out the bottom bracket, do I drill the hole for the cable guide up-to say 7- 8 mm and feed 2 wires through 1 hole or expand 1 hole to 5-6 mm and make a second hole also.

Is it safe with fresh drill bits, or best to use a dremel tool and grind out the hole?

frame is a Planet X Titus Roadrunner

thank you