On a mini system, go for it. As long as the tree is 36" or more 3 taps are ok. Back when I had a similar set up with buckets I had a few with 3 taps on a 5 gal jug. They got emptied 2x a day if the sap was running good. To do it, I used the first tap drop to go into the jug, then I had one or 2 more Tee into it just like they do on a lateral. Once I got vacuum I no longer put 3 taps, 2 became my max then.