Something to also keep in mind is the codec support of the GPU for hardware decoding and transcoding if that’s important to you. The Optiplexes will mostly be fine in this regard but if you see yourself needing AV1 support anytime soon, Intel’s N line is an efficient and relatively cheap option. Getting HDR tone mapping working at the hardware level might also be something to look out for.
That listing is for a Sandy/Ivy bridge processor from 2011. I would really recommend something newer than Skylake at the minimum. For reference: