Unraid on Dell Power Edge T420

I am looking for some pointers and things to look out for when installing Unraid on a Dell Power Edge T420.

I picked up these two servers for a killer deal off of Facebook Marketplace. Will iDRAC continue to work after installing Unraid? I also read some things about needing to flash the Raid Controller. Does anyone here any experience with that, and if so is it a risky endeavor?

Any insights are appreciated!

I did find out that these were used to mine the crypto Chia, so I expect to replace all the hardrives overtime as they go out.

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Server A
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Make/model: Dell PowerEdge T420
Service Tag: 4RM4P22
CPU: Xeon E5-2440
Memory: 32GB
OS: Windows Server 2019 Standard
Storage: About 14.5TB
2 x 1TB Dell SATA
2 x 2TB Dell SAS
2 x 2TB Dell SATA
1 x 2TB Toshiba
1 x 2TB Hitachi SATA
1 x 500GB Toshiba SATA (connected to internal SATA port) (current OS location)

Also has a dedicated iDRAC Enterprise port.

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Server B
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Make/model: Dell PowerEdge T420
Service Tag: 2Y59J02
CPU: Intel Xeon E5-2440
Memory: 32GB
OS: Windows Server 2019 Standard
Storage: About 14.3TB
2 x 3TB Dell SAS
1 x 300GB Dell SAS (current OS location)
1 x 2TB Toshiba SATA
1 x 1TB Dell SATA
1 x 1TB Seagate SATA
2 x 1TB Dell SAS
2 x 1TB Seagate SATA (connected to internal SATA ports)

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