You have a few options.

• PCI-e Wireless Adapters
• USB Wireless Adapters
• Powerline Adapters (not wireless but would work in your case)

All of these should work fine for what your purpose, just make sure to find a good model.

I am currently using this PCI-e adapter and it works perfectly. Make sure to install & update the drivers, I had a pretty dodgy connection at first until I updated them.

Yes, if you have a good wireless router, good signal strength and little interference from neighbors WiFi. People tend to forget the importance of these and focus on the WiFi adapters when even inexpensive USB adapters will work for gaming if the rest of your network is set up well.

I use a PCI-E adaptor as well (linked) and I can say that I've had no problems with it and my AC router. Of course, that could be because they are only 30 feet apart and separated by a single wall, but nonetheless I'm happy with this over a wired option.

https://pcpartpicker.com/product/bQ8Zxr/asus-wireless-network-card-pceac56

Powerline Adapters are usually the absolute best connection. It's all I use in my house and get almost the same speed as my direct cable, and no disconnects.