We ordered two gates.  They work great for what we need, lets the cats go through and keeps the chocolate lab  in his area.  They would collapse if there was any pressure against the gate. We didn't drill any holes in the door frames.   I do wish I could remove the cat doors with a spring mechanism since we have no need to close them.  We used small bungee cords so the gates stay open when we want them to.   The two extensions that come with the smaller gate worked out great for us because with one opening we didn't need the extensions  and used them both in in the wider door opening.  Great price for what we needed.