Yes. There is really no point in paying a company to create a multisig for you and in my opinion, these services are on the borderline of ripping people off. If it's a wallet that will be hot/active, learn how to secure multiple devices across different operating systems/architectures and keep the seeds safe and in multiple locations. If it's not going to be active, minus the former and create the keys on a secure and private system (a guide like [https://bitcointalk.org/index.php?topic=5086011.0]this[/url] might help), and store the keys safely and remotely as you said.