I don’t know which system you’re using, but I owuld recommend you combine the 2 “1800 BTS”
In the end, you’d have only 3 1800 cells instead of 6. It should be possible in all vendors.
why do i recommend this ?
1/ it’s more interesting from capacity point of view to combine 16 TRX in one cell rather than 8 TRX x 2 cells.
2/ it’s easier to tune parameters and adjacencies with less cells.