I would definitley go hotter. For me, I usually do spatched birds on the UDS at 300* or so with a foil pan under them for the drippings. On your cooker, you would want the chicken to be in the hotter area and I don't think you want chicken drippings falling on your beef so bottom rack is the way to go. While it can be a pain to remove one rack to get to the lower one, it's probably your best option.
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