[milesrout]

Landlords are an excellent thing, as anyone that cannot afford, or does not want, to simply buy a house could tell you.

Set up is a phrasal verb and omitting the space is incorrect, yes, but only an annoying pedant would point it out.

It recommends Debian and says:

>I make my guides on this site for Debian 11. If you use another OS, just know that your [mileage] may vary in terms of you might need to change some instructions here minorly.

If you were going to complain about bad grammar, that sentence is a much better target, and yet it is still quite easily understandable.