Radars will easily fit in a container form factor, so will command and control centres, and the cold launcer for CAMM has a tiny footprint. Three containers would be enough to equip something with capable air defence system, and this is exactly what the Army do. Take a generator with and then it doesn't event need plugging in!
These images demonstrate the above;
- SAAB Giraffe radar used by the Army's CAMM system, maritime version also available.
- Rafael MICAD, used by the Army to control CAMM
- CAMM's tiny footprint
Would take a little work to apply this to the naval domain, but the development work is already done.