I have a Karmijn da Sonnaville and a Williams Pride in the mini-dwarf. Both are about 7 feet tall and the same width. They do have to be permanently staked, as both sort of wobble around. But, they've done well, got about a bushel from each. I planted them about 6 years ago, I think, but then actually moved them a year later because they weren't doing well in the original location (too dry and sandy).

Also, I'm having trouble getting information on maintenance. Do these need to be sprayed every 11 days all summer?

Only if you want pristine fruit would anywhere near that number of sprays be necessary. 2 or 3 well timed, well formulated sprays should do it where you are located, even with non disease resistant varieties. This is an issue well covered on this forum if you search for it.

I manage many orchards in a similar climate to yours so I'm familiar with your pest issues.