Can I run multiple bots or chats at the same time Slack and how should I set that up

Yes. Use Multi‑Agent Routing to run multiple isolated agents and route inbound messages by channel/account/peer. Slack is supported as a channel and can be bound to specific agents.
Browser access is powerful but not “do anything a human can” - anti‑bot, CAPTCHAs, and MFA can still block automation. For the most reliable browser control, use the Chrome extension relay on the machine that runs the browser (and keep the Gateway anywhere).
Best‑practice setup:
Always‑on Gateway host (VPS/Mac mini).
One agent per role (bindings).
Slack channel(s) bound to those agents.
Local browser via extension relay (or a node) when needed.
Docs: Multi‑Agent Routing, Slack, Browser, Chrome extension, Nodes.