This post has triggered my PTSD. I had Dell tell me that their only monitors which were compatible with Macs were AUD$1000k+ each, and Apple tell me that the only monitors compatible with them were available from the Apple Store (also AUD$1000k+ each). Determined to not fall into this trap of paying $1000k for a 24-inch monitor, I tried a range of hardware to get things to work.

Setups that did not work for me:

- 2019 MacBook Pro (Intel), Kensington SD4600P Dock, Dell U2412M, Dell U2415

- 2021 MacBook Pro (M1 Max), Dell WD19TB Dock, 2x Dell S2721QS

- 2021 MacBook Pro (M1 Max), OWC Thunderbolt Dual DisplayPort Adapter, 2x Dell S2721QS

- 2021 MacBook Pro (M1 Max), Lenovo ThinkPad Universal Thunderbolt 4 Dock, 2x Dell S2721QS

Setups that worked for me:

- 2019 MacBook Pro (Intel), Dell WD19TB Dock, Dell U2412M, Dell U2415

- 2019 MacBook Pro (Intel), Dell WD19TB Dock, 2x Dell S2721QS

- 2021 MacBook Pro (M1 Max), OWC Thunderbolt 4 Hub, 2x Dell S2721QS

I do still get the occasional strange issue with the M1 and OWC Thunderbolt 4 Hub, such as sometimes one display will not wake, or sit at 30hz until I reconnect it, but for the most part it is an enjoyable configuration.

I suspect that there is a compatibility issue with the M1 and the Dell S2721Q/QS monitors when connected via DisplayPort which contributed to my woes.