NAS server?

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Yes, there are solutions to choose from three tiers. The basic option is to build a thing yourself with a FreeNAS OS. The next tier would be Qnap/Synology server. And top tier something like Promax all-inclusive solution with support.I would avoid the FreeNAS option unless you are an experienced IT professional. It will require regular maintenance and bug fixing. It would the cheapest option in the short run, but very expensive and stressful in a long run.Choosing Promax is super expensive. But they offer free setup and support. But with little IT experience, you would quickly run out of included support hours they offer.Choosing Synology or Qnap is the middle and the safest option. You still get support. It might be slower than paid service, but they do look after you. The most important factor is their operating system. Since there are millions of users using it, it gets updated and improved regularly unlike with expensive bespoke solutions.RS3617XS is a very good choice. You get two PCIe slots for multi-port 10GbE or even 40GbE cards. Each editor will preferably need a separate 10GbE port, but they could potentially share a single port. You don’t need to fill all bays at once. You can do it gradually. But you should surely look at WD Pro drives, WD HGST (now Gold again), or even Exos drives. You don't need a PCIe M.2 cache card. You can use a couple of 3.5inch bays for 2.5inch SSD. It will work at the same speed as M.2 would.If you would want a next-level solution then SA3400 with double speed Exos SAS drives would work closer to SSD speeds and would allow even more editors to connect. But for 2-6 editors (possibly even more) RS3617xs is a perfect choice.I hope this helps.