How many max screens full hd with MST on P4000 on linux

Hello

A P4000 have four output 4K display port
If we plug four mst transport hub with four output (https://www.club-3d.com/en/detail/2411/multi_stream_transport_(mst)_hub_displayportt_1.2_quad_monitor/)

How many full HD screens are seen by the drivers ? 4 or 16 ?

Thanks

It will always only be able to drive four displays, since the gpu has only four display engines (heads).
A possibility would be video-wall converters, those make four FullHD monitors look like one 4k display. Or stack Quadros and use Mosaic.