Seeking advice for enocean implementation

Hi, i’m quite new to openHAB and have yet only a very basic setup using my philips hue.
im looking into enocean and like to implement this for some NodOn relays.

one of my questions here is what would be the best approach to overcome the limited transmission distance?
im living in a two story house where i’m sure i will not be able to reach all receivers/transmitters with only one openHAB server.

currently i have openHAB 2 installed on an raspberry pi 2 and was thinking of using the enocean pi module.

i read about to have multiple instances of openHAB installed and then “linked” via MQTT, but is that the only/advisable way?

thanks a lot in advance for all suggestions/help
Regards Matt