There is a business owner, sole owner in three companies (Two LLCs, one Corp) all taxed as S-Corps. All companies run separate payroll and accounting, with profits/losses flowing through to the owner.

Overall question: What is the cleanest way to do this from an accounting and IRS rules standpoint.

She wants to set up three SEP(s) for these businesses. I would typically set up one SEP covering all three.
1) Can she set up three? Is there any situation wherein that could be beneficial?
2) If so, can she set different eligibility rules (my thinking is NO)?

Assuming we set up one SEP, should it be in the business owner’s name only (not in one of the controlled businesses’ and her name)? Should contributions be deducted out of the Business owner’s personal account/return, or each entity?

Thanks in advance for any help!