Door stopper for hotel room

A basic rubber "door stop" is probably a good idea to stop sudden rapid intrusion,
a properly sized prop with a non slip end under the door knob is said to work well,
and a chest of drawers against the door may slow people down.

BUT

attempts to stop serious violent and lawless invaders may cause more problems than they prevent.
Consider whether this is the case when taking precautions.
If so, you may not wish to visit at all or may need to enter the local "arms race".
Some years ago a journalist attempted to hold a door shut against intruders in Afghanistan. - successfully enough that they shot him through the door.
He died :-(.
His fellow room-mates were robbed but, I understand, lived.
It's possible that all may have been killed if he hadn't resisted or that none would have been.

A friend of mine in Papua New Guinea was one of 3 men who were robbed at shotgun point by "Rascals".
He was certain that he was going to be killed but none of them were physically harmed - he lost a watch and some money.
If he had locked himself in their vehicle the outcome may have been worse. Or, it may not.

ie decide in advance what course you wish to take in such situations.

I do not think you will turn up with a satisfactory solution with the term "door stop" since anything that I would call a doorstop (something that wedges between the lower edge of the door and the floor) is highly dependent on the floor type. On a carpet floor, certain materials might have a completely different effect than on tile/marble.

Further, even if there are chains installed, doors can be opened as you can see in this youtube video and also here. On top of that, there is a serious security flaw with a very widely distributed hotel lock.

When it comes to security, I would consider against whom/what you actually want to protect yourself and then act accordingly. Are you afraid your valuables are being stolen? Maybe the room safe is the best choice then. Or is someone after you personally? Try to figure out how to lower the risk of you being a target instead of trying to prevent the consequences of you being a target to happen.

Since on the downside, if someone is determined to get YOU as a specific target, there is little you can do. On the upside, there is probably a lot you can do if someone randomly picks you or your hotel room as a target to keep the damage low without trying to prevent them to enter your room, which is likely much more difficult.

Browsing around the internet I stumbled on this doorstop. Quoting the product page:

Detects forced entry through doors / Loud 110dB+ alarm sounds when the door is opened / Strong deterrence against intruders / Easy to install / Indoor use only. Alarm sounds loudly when there is an attempted forced entry through a door - A great form of theft deterrence.

It sounds like something you are looking for.

_{Full disclosure:
I am not affiliated with the manufacturer or seller in any way. Just found this and it reminded me of this question.}