Another option for WiFi only, especially if you don’t have a free slot, is a USB WiFi dongle.
The following one works perfectly on my Dell 7010 USFF. A driver from Edimax is required to use it but it is a native MacOS app and works fine:
EW-7822ULC, Edimax AC1200 Wi-Fi USB Adapter Supports Web 2, MU-Mimo, Nano Size, for Windows, Mac OS, Supports Computer/PC/Laptop/Desktop Windows XP/7/8/1/10/Vista, Mac OS 10.910.14
https://www.amazon.com/dp/B01MY7PL10/?tag=tonymacx86com-20
No BT but I don’t need BT on all my macs