- Sparrow for coordinator wallet
- Personal Electrum server instance for privacy (I’ve used ElectrumX and Fulcrum, but electrs is also popular)
- Minimally 2-of-2, preferably 2-of-3 or 3-of-5.
- No vendor has quorum
- Prefer open source

My favorite vendor is Coinkite (ColdCard), but like I said, no vendor should represent a quorum of keys.

Additionally:
- consider rolling your own seeds, offline from your own entropy source
- consider using a passphrase
- consider geographic distribution of seed material 

 You need to think about building from source or reproducible builds also