Apple tv + free trial

found also this: https://www.apple.com/promo/pdf/EN_US_ATV+_Promo_TandCs.pdf

and it states - Offer cannot be combined with other free trials or offers for Apple TV+. - so yes, only one device will do a trick :-)

well, since it's one time offer, you cannot activate both nor use 2 years, and there is no way to select device, so seems like you have only 2 options:

1. remove second device from family group and activate free year independently on family group. not sure if it make sense, since you loose benefits of family sharing
2. activate tv+ free year and forget about free year from second device

organiser of you family sharing group must login and activate this, and then it's activated for all other members

to clarify: this free year comes with new devices, do you have 2 such?