As per attached installation sheet the most that can be put in one plate is 3 of these dimmers. They must also be de rated accordingly.
No. of dimmers
|
Max. Load per dimmer
|
1
|
350W
|
2
|
240W
|
3
|
200W
|

https://www.pdl.co.nz/products/detail?CatNo=PDL654PBM&itemno=PDL654PBMWH&backto=/search?q&tab-document-1=0