I have designed my N gauge layout with OHLE in mind
There used to be a supplier of UK specification OHLE supports, but my last layout never got that far
If you only require basic masts, then the Dapol range may suit you
Sadly mine is a mix of 2, 4, and 6 tracks, so only some the Dapol items suit me
For the other tracks I have planned the use of the N-brass items, but this still leaves me requiring the full height masts and supports