Based upon the facts you present it appears that you intend to make the investment as a direct investment. You may set up a holding company which 100% owns various subsidiary locations. This model will fit your intention of spreading the investment funds and required full time jobs amongst the business subsidiary
EB-5 projects can have phases, but the investment should be made at one time. Please be aware that the job creation still needs to occur as per the EB-5 rules during the proper time period.