1
Start with one collector, one workspace
A single collector easily handles a few hundred devices; there's no need to over-architect this until you actually have multiple sites.
2
Add devices as you touch them
Rather than a big-bang onboarding project, add devices to Zynty as you're already working on them, discovery scans catch the rest later.
1
3
Route everything to one place
Point all alerts at a single Slack channel or your personal email/phone; you don't need routing rules by team when you are the team.
4
Turn on config backup early
Even solo, automatic config backup is worth enabling from day one, it's cheap insurance against your own future mistakes.