I want to install a probe thermometer. My chimney connector has a pre-drilled hole about 6 inches from the collar. 1. Is this hole designed for a probe thermometer. If not, what is it there for, and can I use it anyway? 2. Is it too close to the stove to get accurate readings? (I'm reading most people have theirs at 18" but my masonry chimney would prevent that. Please see picture below. Thanks in advance.