The Telperion podcast is good one. https://soundcloud.com/asymmetry-podcast/telperion-farms-1
I’ve used wood and tile, tile wins. Use 18" instead of 12". But even tile is a pain. The big growers use root control bags and I’m going to buy a bunch and start using them. Digging up a tree or two is good hard work, but when you’re digging 5-8 per year it’s not fun anymore. Plus my soil has bit of clay in it (even after being amended) so I’m not getting a lot of fine roots which is frustrating.
I would let them grow, but prune to allow light to interior branches so you don’t get die back. If you move them, I wouldn’t do work on them at the same time. Don’t bareroot them. I would fertilize. I wouldn’t dig them up yet if just a couple of years in ground if you can help it, but understand you have plans for that area. If you’re bored, pop one up, check the roots, spread them out and put in root control bag then replant. Maybe around year 3 dig up half, in year 4 dig up the other half. Experiment, some people would put right back in ground after root pruning. Others might put in nursery pot for 1-2 years to develop good roots then put back into ground again. You have several so experiment and have fun with it.
In terms of ground growing my experience has been that 6-8 years is early, 8-12 is moderate, 12+ is ample time. Of course species depending.
There’s a bunch more here: In ground root control bags