With those speakers, in a small room like that (I have a room same size practically that I have dealt with but more densely furnished and less bare walls which helps, see my supplemental system photos), bass levels/extension is probably not a problem, so need for subs is unlikely.
A couple feet or so from walls to avoid early reflections may be all that is needed for better results.
A couple feet or so from walls to avoid early reflections may be all that is needed for better results.