I just got my hives, and had ordered top feeders (inevitably) from Betterbee, the ones with feeder access at both ends. They don't have screens, just plastic guards. My question is, do I put it above or below the inner cover? And is it supposed to raise up my outside cover by a substantial amount? I thought it would "tuck inside" a bit better...I'm worried about other flying insects getting in through the top once I install my bees.