I might be in a similar situation to you - I run a small photography / video studio in Hong Kong with my partner and better half. She handles creative while I do the production / business side of things. We're both the lead photographers in our studio and we employ two full time staff and anywhere between 4-10 freelancers depending on the size of the job.
With this in mind, we churn through anywhere between 5Tb to 20Tb in a year's worth of raw photography files (this year will be a big one). I've posted our studio workflow in this thread here in case you're interested but in terms of Synology NAS setups, we are fairly small fry. We aren't shooting the Queen's jewels or anything ultra-valuable like that and (touch wood) we haven't suffered any large data losses yet. So all of this means that we do have to watch what we spend our money on.
I own three Synology units - I would say they are at best the consumer level choices though:
- Synology DS416Play (4x 8Tb WD Red in SHR RAID setup)
- Synology DS414j (4x 8Tb WD Red in SHR RAID setup)
- Synology DS214Play (2x 4Tb WD Red in SHR - soon to be RAID 0) at home as a media server into a Samsung 50" smart TV
Once we start shooting more video, I can see us needing something with more bays and power. Right now, all of our studio computers connect to the servers via a a 10-port gigabit switch that is connected over LAN to a n Asus AC3200 office router.
We also have an Orico 4-bay USB3.0 SATA HDD enclosure with a random assortment of 3.5" and 2.5" HDDs from before 2014 that is connected to only one computer at a time via USB, though this is more for accessing random old personal files from way back when.
Word of advice: that 10-15Tb "only ever need to" is going to grow fast - depending on your workrate and throughput. We started off with a 12Tb DS414j four years ago thinking it would 'be enough' - how wrong we were! I'm already beginning to wish I had purchased an 8-bay NAS with 12Tb drives in it and I'm looking at 17.88Tb available space on our DS416Play!