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Far too late to keep things simple!! :)
I purchased ChronoSync a few months ago having trialled both. I know you've mentioned your appreciation for SyncThing before so I'll have to look again and see what the differences are.
Pulled up short of buying a NAS at the moment. I was starting to look for server software thinking it might be better to run an NUC with attached storage. Partly because I wanted to run Roon and Plex on an i7 or similar and that level NAS is £££.
At the moment I'm using a 2010 Mac Pro as a main computer with 22TB on a mixture of HD and SSD and I'll probably add an ARM Mac mini when they arrive and relegate the Mac Pro to server, maybe run linux on it and share a monitor with the arm Mac mini.
On the other network I have apple time machines backing up the system disks of 2 main computers that are based on the first network. That's the end that could use a NAS but that's why I'm thinking cloud storage for those backups would make sense since I'd no longer have to worry about network connections, drive reliability or power consumption. It's a big step for me having dealt with the storage/backup cycle professionally and as a user for 35 years.
I'd keep things simple in your scenario.
I'd have a NAS in each location, and SyncThing installed on both... and let the software keep things replicated constantly.