If I were you I would try to get the three best possible academic LORs that you can and then one stellar professional/work LOR. Then use two academic and one professional LOR for all your apps and save the last LOR in case you need it for a WL.
... do need at least 1 academic, but I didn't know ... one will be from an academic institution, that I work for ... help to bridge the missing academic LOR. Hmm... maybe I can ...
... I can get two good academic letters. I have other professors ... like the general rule is, academic letters are preferred over pro ... I go for a third academic letter or do I need ... , I can make the third academic one a good one.]
... similar dilemma. I have one academic locked up, I can easily ... that I can find another academic letter from like 8 years ... sneaky way to get another academic LoR this summer and wanted ...