It will likely work even though signal does not travel vertically as well.
What are your expectations buying this card. Your router is only single band so you won't be able to use things like the 5g band.
If you are using it only to surf the internet then your internet speed will limit your speed well before any wireless card make any difference.
If this is a new device for a new PC then there is nothing wrong with it, it is a good middle of the road cost wise card that a lot of people have had little problems with.
If this is a upgrade then don't expect a lot of difference.
So would a downgrade to a TP-LINK TL-WN951N Wireless N PCI Adapter Network adapter - PCI make any difference at all in my sercumstance?