Connecting multiplus 2 on Attic to Fusebox

I have a 5x6mm2 22 meter ac cable running from our main fuse box to the Attic where 1 multiplus 2 5000 will be connected.

My plan is to use a 4 pole c32 automatic circuit breaker in the main fuse box to fuse the victron and the cable.

The brown and blue wire will connect from the first 2 poles of the automatic circuit breaker to the ac in of the multiplus. The gray and black wire will connect to the critical loads output of the victron and to pole 3 and 4 of the automatic circuit breaker.

Is it allowed to use 1 cable for ac in and critical loads?

Is it allowed to use a 4 pole automatic circuit breaker in this setup?

Or do I need an extra wire and and 2 automatic 2 poles circuit breakers?

Using 2 breakers means that I can’t disconnect the multiplus in 1 move in the Fusebox.

I have a graduate as electrical technician, and connecting the multiplus without emergency power is clear to me how to do it according to the rules. But never had to do anything with emergency power.

The installation is placed in the Netherlands.

I use a 100A 4 pole manual disconnect for my ACin and AC1out (all my house power comes from AC1out), in UK we have to have lockable disconnects, not sure about automatic disconnect though.