I'll probably get shouted down for saying this but i dont think that fishing pop up in a solid bag is the way to go.
Imo (and there will be differing ones) a short 3 or 4 inch supple braided rig with a wafter OR pop up , with a shot to balance it on the deck, on the hair.
To me , a pop up hovering above the freebies sticks out like a sore thumb .
Depends on competition for food and how the fish feed i spose but i'd be wanting me hookbait to blend in with the bags freebies ?
But thats just me .
Welcome to the forum by the way .