You’re probably on about going rate at those numbers.
Think my SMax was about £800 (4+ years ago) removable with dedicated electrics, ECU update and 13pin.
I’ve priced various cars lately in my hunt for a replacement for our main family car and all come in around that number fully fitted.
One thing to check on Fords is whether a fixed ball clashes with the reverse sensors. SMax and Galaxy are known for it. That aside I’d happily have a fixed ball but I’m using it near weekly over summer.
Top tip if you get a removable then have a small rubber mat in the boot to kneel on when installing / removing on wet and horrible days.