Can a trust hold a Fidelity cash management account?

I have a Fidelity brokerage account held by my trust. I was able to set it up that way when I opened the account online. I have now started to open a Fidelity cash management account that I'd also like to have held by the trust but do not see that option -- only an option for individual or joint ownership. I'd like to know if trust ownership is an option. Perhaps because my brokerage account is held by a trust that takes care of it. I'm not sure if the cash management account is a stand-alone account or a subset of the brokerage account. Thank you for your thoughts.