lvm ssh md raid

Hello to all, I am planning a new proxmox install like this: 4 identical nodes with different storage - for 2 nodes I wish to use 2 ssd with different capacity (120 Gb and 64 Gb) - I wish if it is possible to alocate let say 48 Gb / each ssd - at the instalation I wish to use LVM at top of 2...