This is a design for modern american homes to hold doors at an ajar state. I use this for cats to access our bathroom for food and litterbox without allowing the dogs to enter as well. It holds pretty solidly on it's own (this is the the 6th version and has been used successfully for months now) but my advice if you have more insistent dogs or loose door catch would be to add a layer or two of electrical tape to where it inserts into the frame. No tools required, very little support necessary, holds up to door slamming. Printed in PLA.

Short video