I use my Festool TS75 with a Festool special laminate blade. Expensive, but incredible finish. https://ffx.co.uk/product/Get/Festool-190X2.6X30-Tf54-4014549103456-Special-Saw-Blade--190Mm-X-30Mm-Tf54-54Teeth
Unscrew the bolt (indicated red) on the flat bracket and remove the wire.
Fit this bracket to yhe ceiling.
Put the other bracket into this bracket and do the bolt up. (Indicated blue).
Connect wires appropriately.