[Alneyan]

Facilities are one per planet, so putting several facilities on the same planet will not help, but putting them on moons will work. System-wide training (the Psychic facilities) are one per system, but they stack with regular facilities.

Ship and fleet experience are unrelated, so you do not need to have any fleet experience at all to benefit from having a 50% experienced vessel. They are rather training at two different levels: tactical level and strategical level, the latter being far easier to achieve in SEIV.