I like a combination of individual stands and benches. Benches are more versatile, stands highlight individual trees.
My benches are high enough that I can store my trees under them to mulch in for the winter.
I am fortunate to have space enough that benches face basically 4 directions, so I can rotate the trees, while still seeing the front.
A good mix of sun and shade is ideal, so you can move them around based on needs.
Build them taller for viewing. Mine are between 3'-4.5' high.
Make the design simple and repeatable.
Be sure your water source is close by.
Cement them in, be sure they're level! You don't water pooling on one side of the pot year after year.
If you're like me, you'll wear out any grass in front of them over time, so I removed the grass, installed a stone curb, and used DG/1089 as the surface. It's easy to weed and leaf-blow.
If/when I redo anything, I would have weather-sealed the wood, or used a synthetic. The spacing on some of my stands is a little off, so I'll probably change that over time, and I like the look of 6x6 posts in the berm better than 4x4 posts everywhere else, so I'll probably move to 6x6.