Seems to me you are concerned/worried about a non-issue with connectivity. RCA interconnects (single ended topology) have been a standard for 2 channel audio/hi-fi for a very long time. Actually, since the 1960's. The advantage of single ended topology is simplicity of the signal path. With short interconnects you have nothing to worry about, lengths between 1m - 5m in length should be fine. Pick brands that are well regarded and recommended on this forum or other reputable reviews. My interconnects are made with Mogami W2549 and sound great. Most separates will have provisions for both RCA & XLR connections, while others may be RCA only.
XLR interconnects are extremely convenient and preferred for specialty use, like home theater for connections between a Preamplifier-Processor (Pre-pro) and multichannel amplifiers. Very long interconnect cables may also benefit.
As pointed out by several forum members, XLR connections don't necessarily indicate that the device offers "balanced" topology that can offer some ascribed benefits. True balanced topology imposes twice the circuitry into the signal path. Many believe that abandoning single ended is not an advancement.
Just offering the above for what it is and not attempting to re-write audio history.
Enjoy the music!