Fitting insulation to sub floor before screed - Securing?

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Hello

Just about to start fitting our insulation to the subfloor.
We are going for RTU Ultraflo screed - Hemihydrate self levelling for UFH and had the rep out to quote.

The concrete subfloor was left with a tamped finish.
Screed rep suggested we have the subfloor "skimmed" or screeded to leave a flat and level surface for the insulation to be laid. Is this really necessary? I can see what he is saying, if the insualtion is bridging a hollow and bends into it, the screed above could crack.

The subfloors were laid by a contractor, i spoke to him and he says he never been asked to do this before and always lays the insulation on the tamped finish.
We have a couple of issues areas where the level is a bit off 20-30mm (suggested to fit additional insulation?), some aggregate build ups at edges and a few joins that will need smoothed over, apart from that the floor is quite smooth.

Would it be wise to fix the insulation (100mm Xtratherm board) to the subfloor (with long bolts/screws?) to prevent any chance of the boards flexing?

Cheers Neil
 
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