In either event, use what is called a saddle to attach a lateral (the 3/16 or 5/16 from tree to tree and then to the main) to a lateral. Over the years I've used many different saddles, but after I first tried the DSD saddles I never bought any other brand. They cost less and are less prone to leaking. That being said, sometimes with good slope (8% is good) and the right layout, you do better just running the lateral to the collection point and use no mainline.
To help you know if that is an option, we need to know more about the woods lay of the land where you will be tapping and where you can collect the sap.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.