Which types of speakers are ideal against a wall?


I currently have rear ported floor standing speakers (Dali Euphonia MS-4) against the wall due to no other room options.  Are these speakers feasible?   I also have 2 Rel 528s along side each speaker.  I am looking at replacing the speakers.  I also have 2” acoustic treatment w 2” brackets behind the speakers.  Any speaker suggestions in the the 5-7k range (used) welcomed.  

Equipment:
Modwright 150 SE 
Dali MS-4
Rel 528 Qty 2

Room 15 w open wall  and 17 L 
puffbojie
You can certainly design a speaker that goes against a wall, and you can certainly market a speaker as "placement friendly", but physics is physics, and the longer wavelengths are just going to interact with the room and create resonance problems no matter where you place your speakers (actually, all frequencies do this but the problems are less apparent at higher frequencies).  Where you place the speakers, and where the resulting resonance nodes occur as a result, is the easiest way to tame those resonances.  A 100hz signal wave will be about 3.5 meters long.  Do your own math, but if moving your speakers around is not an option, then you will need to use room treatments or DSP.
A problem with placing speakers against a reflective surface is that timing and spatial cues are harder for the brain to decipher, and the amplitude of the reflected sound can be louder and more focused because of the shorter path it has to the ears.  Putting speakers in the middle of a room allows a longer interval before the reflected sound from the speaker reached your ears, and the reflected sound will be lower in amplitude.  This gives your ears a better chance to process the direct sound before the reflected sound reaches your ears and muddles things up (mostly true for higher frequencies).  Lower frequencies (under 100hz, but it depends on room size) will tend to activate the whole room and will have less directivity, but the presence of resonance nodes where waves intersect and voids from comb filtering will be more obvious.
I have 2 inch acoustic broad band treatments behind speakers with 2 inch extender brackets pushing them out further from the wall.  Is this typically a best (placement / product) practice for treatments?  I also have one in the right corner with corner brackets. The left side does not have a corner or wall.   I also have one inch treatments on the back wall but wonder if diffusers would be better here?
As mentioned the Vortex by Von Schweikert are designed for that.

The older NHT 2.5, 2.9, and 3.3 (which is a damn fine speaker) are also designed to be up against a wall.  

If you can find some 3.3's... you could do a lot worse.  Absolutely zero issues because of the wall coupling. They are designed for that.

There is someone out there that makes foam strips also for the fronts.