You need to wire in series or in parallel depending on your driver dude. I go driver neg to board neg at one end, then board pos to board neg in the middle and then board pos to driver pos at the other end. At either side of the board you should have either a pos or a neg with a wire going in not both at both ends.
Principle
Ive got 8 together like this in a 1.2x1.2 but run them in groups of 4 using two drivers. The 320 driver Josh is talking about is a beast
You want some wagos their handy (tlc electrcal) , decent electrical wire mines in the attic (screwfix/tlc) I'll have a look which it is later for ya and some aluminium angle to screw the boards to, some little nuts and bolts and some cable ties to make it all look nice. If you have a chat with invis they will supply wagos & screws you need when you order the boards or just ask them what size screws their a lovely bunch of chaps. If you dont want to use the alu angle you can buy their heat sink aswel, the newer 150 R/BR boards are slightly different to the older ones i used so may need the heat sink
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