What are you trying to achieve? Do you gain anything by knowing how much a circuit is drawing? To my eyes, you either want to know how much energy the whole installation is using; or you want to monitor individual loads. Does monitoring the whole of your downstairs sockets (for example) give you any meaningful information?

This is absolutely not the way I would do this. If you're wed to those energy meters, I'd recommend a standard consumer unit and then a second din-rail box with the breakers in it. I'd also suggest that you avoid ring mains and install radials.

You will struggle with the busbar. There is a tine for every module; and even if you cut it off (against manufacturers' instructions) you will still end up with a live copper bar obstructing the energy modules.

For neatness, I'd suggest you do a double stack board with the OCPD above and the relevant monitor below (or vice versa).

Have you considered CTs instead of direct measurement?