Effectively the NAS stores the VM’s and the server would simply run them from the synology nas, basically creating a central storage location.
That sounds very sensible ‘central storage location’ if indeed the Synology NAS is RAID 5 and is HArdware RAID, then this is a strong option.
The 5 x 4TB WD Red drives setup in a RAID 5 gives you 16B of real disk spacce and a hot spare, so again, a good choice.
As VMs take up approx 1TB, plenty of room for good backup, before you start and then go for it. 
Will be interesting to see how busy your HP Microserver Gen 10 plus with its 2 x 2TB drives in RAID 1 is once you have performed the migration ?
The Synology NAS DS1819+ Quad-core, 2.1 GHz CPU and does have the option for adding an Optional 10GbE add-on card to provide high-speed data transfer rate.
Alas your Switch will slow data rates down, so hopefully 10GbE card will not be needed
In a completely sane world, madness is the only freedom (J.G.Ballard).
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