Spacing really depends on the combination of the variety and the climate.
I couldn't get any West coast bred varieties - they were always sold out within hours of arriving at our garden centre, so I bought a dozen of the only one available and planted them on my allotment which is 20 feet wide. Within a year they were out to the edge, invading the path and almost into the neighbouring allotment. I checked their name online and found they had been bred for the prairies - super hardy.
My nephew who owns 10 acres dug them out and has been selling fruit from them.
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