So it's connected to your router via Wifi then your router is port forwarding for remote access?
I suggest you disable port forwarding immediately in the router or you may find you have no cameras or pc for Mike to configure. When you port forward, your router announces to the whole internet "I'm here, I have these devices, who'd like to connect?". Any number of millions of bots or nefarious idiots can spot you on the internet because of this - there are search engines that specifically show only connected devices. If they choose to connect, they can do so without any security and either download malware to your pc or cameras or corrupt their firmware so they can no longer function. It's literally the same as leaving your front door open on your house and putting up a big sign that says come on in, help yourself!
The Whole reason people use a router based VPN (not a subscription or external VPN) is because it hides your pc and cameras from the internet. They cannot be seen. They don't invite connections. If anyone wants to connect, they not only need to know you're there in advance, but the IP address etc. They need to be able to connect using a highly secure password and then having connected, they need to be able to converse using encrypted data based on them having the correct key at their end. Any requests or data not correctly encrypted is ignored and rejected. If they can't match these security measures, they cannot get access and the encryption is very very secure - Bank Level.
If you're port forwarded. It's only a matter of time, anything from minutes to days or weeks if you're lucky, before someone gets in and thinks it's funny to destroy all your cameras or worse.