@AnalogSteph you are right that there are also other solutions. Very small speaker like the EVE SC203s might als be okay but will also bring compromises which aren't great for monitor purpose.
IMO a typically none coaxial speakers like KRK RP5 G4s in a near field setup with a listening distance of about 0.5m doesn't work and in such a small room with a lot of reflections you have to choose such a distance to get as much direct sound as you can.
The vertical angle will be significantly altered by the slightest move of your head or body. If you use a none coax monitor which isn't very small, the movement changes the tonality in the very important frequencies of 2- 3kHz since the typical cross over frequency is there. In addition the balance between the tweeter and bass with a standard two way design will also be altered since the distance difference will change a lot in the very near field with movements.
Some very small none coax studio monitors might also work therefore I recommend the IK multimedia speaker. It has the benefits of providing good tonality and much deeper bass for its size. But these monitors have to be developed exactly for such a very small listening distance. The vertical directivity problem of the crossover frequency are here typically moved to higher frequencies like 3,5kHz which is better but the issue isn't gone.
The JBL 104 has some directivity problems in the higher frequencies. Which isn't great but IMO a much better compromise than the issues in the very important midrange of typical none coax speakers. It was also developed for very short listening distances and IMO you can hear that if you compare them to other monitors.
Since the room doesn't allow high quality play back such cheaper speaker might be the good enough solution.
Speaker hiss is definitely an issue which will exclude some speakers if you can't tolerate it. The 104 isn't great in this regard if higher levels are required. Speaker hiss is a game of luck with some cheaper monitors like the i loud since there are some perfectly quiet ones and some with a hiss within the same speaker models which is due to tolerances in the electronic components.