Yes, it works, but I generally advise against 2 bay NAS, because you lose half of the storage capacity in a mirrored RAID1 and in case of a disk exchange or failure you would have to buy another expensive large disk. Also, the DS220+ only has an older Intel Dual Core processor.

I recommend this model, it has 4 GB RAM, a much faster Quad Core AMD Ryzen R1600 CPU and equipped with 4 x 4 TB disks, even 12 TB of data would be possible and that too with additional hardware failure protection via RAID 5. And 4 TB disks are also much quieter in operation than 10 TB disks.

Synology DS923+ (0 TB)

A DS420+ would also be ok if it had to be a NAS with Intel CPU, the NAS has a Quad Core Intel CPU.

According to the data sheet, yes. The only limit that exists is then only for the volume, which is even 108 TB.

Technical questions are answered by Synology