kyle2020,
Your setup looks fine to me
. Personally I would only mount my radiator vertically. However, as long as your temps are ok you should be fine. The true test of your watercooling setup will come during the summer months (if you don't have central air, etc). IMO, as long as your temps are in the low to mid 30C idle (or lower) and no higher then the low 40C mark you should be fine.