If you do not receive any settlements on behalf of clients, you never receive advance fee or cost payments from clients, and you are never asked to hold other funds on behalf of clients, then you may not need a trust account. The better practice, however, is to maintain a trust account to accommodate those times you do need one. Most banks waive their service and transaction fees on IOLTA trust accounts, so costs are negligible.
Not so long as the number of Minnesota cases you handle where a trust account is required is insignificant. So long as only an insignificant portion of your practice involves Minnesota cases, you may maintain a trust account in your home state in accord with their rules.