spacings

Blueberries will grow to 3-5ft, depending on the variety. They will grow more on deeper, damper and more fertile soils.
They can be kept small by regular pruning.

Raspberries don't really matter about spacing, although 18 inches is probably about right.
Within a few years, the suckers they send up from the root spread will get all over the place anyway and they'll spread out with multiple shoots ("suckers") coming out of the ground like weeds.
You can transplant these "suckers" to start a new plant wherever you please.

Cranberries are slightly smaller than blueberries.

Note that blueberries require moist and mildly acidic soil. Cranberries like very moist and very acidic soil.
They are bog plants and they'll do well in a boggy area.
In such boggy areas, they may not need special "ericaceous" compost because boggy ground tends to become acidic as a result of atmospheric gases being absorbed into the wet ground to form a weak acid.

thanks for the reply