20 ft. spacing is usually recommended for avos, but more would be better, especially if you intend to grow your trees larger.
I prune my trees to hold height and spread down.
So far, 18' to 20' spacing is adequate.
But, the avos are not planted next to each other.
Other smaller trees are intermingled with them.
I can pick from a ladder without the trees growing into each other.
I have grass planted under our trees, cut like the rest of our lawn.
There is little to no bruising of the fallen fruit.
The tree naturally drops the fruit before it's ripe, still hard within a few days of softening.
I usually, gather fallen fruit daily for eating.
They are usually ready to eat within 2 to 3 days.
It's easier to pick them up, than dig through the tree's canopy from a ladder looking for them.
Sharwils are hard to judge for readiness.
Ripening is judged by the skin loosing its shininess, turning into more of a matt finish on their surface.
Otas and Lamb-Hass' types are easier to judge because of color changes.
Hass turn black/dark purple, Otas yellowish with brown areas.
All three are very good.
But, I prefer the Sharwils and Otas.
The Sharwils get larger, most about 1 to 1-1/4 lb.
We've gotten some huge ones up to 1-1/2 pounds in size.
The Hass and Ota are more regular in size, 3/4 pound +/-.
Our avos are from grafted seedlings.
None are seed grown.
The way avos bloom, it is very unlikely their seed grown fruit will be like the parent tree's.
All avos seeds are likely to be hybrids.
Because of that, the fruit will likely vary from its parent's variety type.