It all depends on the juice. You need to give more info about what ratio the juice you use is.
If its a thin juice thats like 80PG/20VG, you only need one hole and the hole needs to be fairly small or it will flood the carto.
For example, find a picture of what the hole looks like for the Smoktech Dual Coil Tank pre-punched cartos. That hole is small, but it feeds the juice great.
For a thick, higher VG juice though, that small hole is not big enough to feed the juice to the carto very well. You should use higher PG juices bc they work better in a tank, but you can use VG juices, but the carto needs to be punched correctly. I have one juice I really like but its 100% VG. For it to work I either punch holes that are alot bigger, or if its a pre-punched carto with the small hole, I use a finishing nail and hammer and make the hole almost the diameter as a finishing nail. I also then also punch a second hole the same size on the opposite side so the thick 100%VG juice can feed quicker.
You could always try it and if its not feeding well, take the carto out and make the hole alittle bigger. Its better for it to be smaller and then make it slightly bigger if needed. If you make the hole too big though from the start, theres nothing you can do bc it will just keep flooding the carto and you will need to use a new one.
With any tank, you should always take primer puffs to help feed juice to the carto. Take a few slightly harder draws on the carto without pushing the button. That will feed juice and ensure the carto stays wet. Look for little air bubbles when you take primer puffs. If little airbubbles are coming out of the punched hole, that means the carto is being fed juice. If you dont get any air bubbles, you need to take the carto out and make the hole a tad bigger or youll risk burning it bc it got too dry