I'd like to sign my husband up to redeem for Hertz, BA (and possibly Iberia) , and Southwest. Do I get the airline redemption options if I sign him up from Hertz, or do I need to find him a hotel partner? And among the hotels, does Accor let you use vouchers from multiple Le Club accounts to help settle a bill at check out?

Yes, trying to maximize household earning here. Any of the other US redemption options allow household accounts or free points transfers between household members like Hertz does?