Trimming a floating floor at the skirting

Hi, I am going to help a mate with trimming a floating floor. The reason is that the internal wall that is a face brick is to be rendered. The floating floor (ends of the boards) needs to be trimmed back 20 mm to accommodate the plaster after which a new skirting will be installed. What I need to know is what would be the best tool for trimming the floor without lifting the whole floating floor? I did see a blade to cut most materials that will fit an angle grinder, but that may not be a safe...

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