Welcome back, Bruno.
You have a 3-phase supply in Denmark - is that 3-phase, 4-wire (L1 - brown, L2 - grey, L3 - black & Neutral - blue) 230 / 400 V, plus the safety earth? I shall assume it is.
[Your diagram is too small to read - can you post it here, please?]
If you want the best possible accuracy, then it would be one emonPi and two emonTx’s - one measuring each phase. If you are content with reduced accuracy, then you could have two emonTx’s each with the 3-phase sketch, one measuring the grid connection and the other measuring the PV infeed, plus an emonBase with emonCMS to collate, record and display the data.
For the emonPi option, you need 6 c.t’s, 3 a.c. adapters and a d.c. power pack & cable for the emonPi. For the emonBase option you need 6 c.t’s, 2 a.c. adapters and a d.c. power pack & cable for the emonBase.
(“Reduced accuracy” is because the emonTx has only one voltage input, so it must assume that the voltage of the other two phases is the same. How much error that will create will depend on how accurately the voltages are balanced, and you cannot control that.)