You should not trust it, alt least not from public internet.
Some time ago thousands of router was hacked trough bug in software using WinBox port!!!
From internet, you should use VPN.
I VPN is not an option at all, then follow this:
- Use another port than default. Do NOT use 8291.
- Use port knocking. This prevents someone from seeing open ports.
- Use a long and good password.
- Use access list to prevent any random internet from accessing your router.
- Log everything. (See my signature for example.)
- Upgrade firmware to latest stable release
- ++++
Why do not use Splunk to monitor your MikroTik Router(s)? Look at this page in how to set it up.