That location seems like it would be pretty good (although there's always concern about heatsoak in the Miata engine bay, at least with the traditionally used GM sensors) but you want the element to be in the air stream. Using the current bolt hole on the side of the flange would not work unless you bore it out to countersink it quite a bit to get the sensor into the air stream. Drilling and tapping a hole just forward of that (after the nipple where the intake clamps on but before the flange) would probably be the easier solution.
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