Pool Layout Question

I have decided to change things up and get rid of some old drives (some are going on 8 years of in-service time) and a lot of them are 5400 RPM SMR Seagates.

I have decided to go with 4 20TB CRM drives in a mirrored pool (2x2 mirrored vDevs) and I just wanted to check in with the community before I do so.

My current spinning rust pools are all RaidZ2. I plan on replacing my production pool (2x6 RaidZ2 made up of 6TB (mostly CMR) and 4TB (all SMR) drives) with the above mirrored pool...

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