PF: Is it recommended to have a partnership agreement between the beneficiary and the non-academic placement host?

The non-academic placement host participates as an Associated Partner in the proposal and in the WP MSCA 2021-2022 (p.93) it is written:

“When associated partners are involved, the beneficiary is encouraged to sign a partnership agreement with them to regulate the internal relationship between all participating organisations. The partnership agreement(s) must comply with the grant agreement.”