Can you tape or glue this carpeting to concrete? Can you recommend a certain tape or glue to use. Can you join two carpets together to make one large carpet?

Yes, you could use our double sided carpet tape to adhere this rug to concrete, and you could certainly place two rugs side by side to make one large rug. View our double sided carpet tape here: https://www.flooringinc.com/accessories/double-sided-carpet-tape.html