you dont need to undo all 3 in most cases with a strut brace, mine is only 2 bolts, the plastic does bend enough to get the nut off, i have lowered 4 fiesta ST's now and fitted a strut brace on 2 cars and never removed that plastic
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Red Escort 1.6LX
Then - Red Escort 1.4
Then - Silver Fiesta ST 170BHP
Then - White Fiesta ST MR200+
Now - Mitsubishi Evo IV Forged 2.3 500BHP
and Mondeo Mk3 2.0TDCI