It is really very good that you think about security of the funds of investors. Will investors have some signed agreements for the trust management of the funds?
Yes, an investment agreement would be signed for direct investments in the funds. Or simply invest in token sales for the managers best discretion, in which case US accredited investors must sign a SAFT with 1-year lock, and others could participate in an exchange sale or ICO.
It is very good that you work with investors from US. Are there any restrictions on citizenship of investors?