As I understand it, all cells will be one or other colour, which means only one colour need be set by Conditional Formatting. (The other can be applied with 'standard' fill, leaving the CF rule to override it where applicable).
It might be easier to fill 'standard' with green and use CF for red but the formula rule for green (ie formatting the whole range red with standard fill) might be:
=OR(AND(OR($A1="Prime",$A1="essential"),$B1>=0.9,NOT(ISTEXT($B1))),AND(OR($A1="maintenance",$A1="Consumption"),$B1>=0.96,NOT(ISTEXT($B1))))
This assumes the tiers are in ColumnA and the percentages are in ColumnB (where the value 1 represents 100%, even if formatted to appear as 100%). The Applies to range should be =$A:$B or a number of rows in those columns, to suit. The Applies to range may be set by selecting ColumnsA:B before entering the CF formula rule.