Hi - first time poster! I know there's a few

Hi - first time poster! I know there's a few threads on here already about terracotta (cotto) tiles but we're in need of some advice for a specific situation and was hoping someone out there could help us. We're a year and a bit into a renovation of a 'modern rustic' (did I invent that genre?) 25 year old property, with the work being done by a renovation company. Half of the house has existing cotto tiles, which hadn't been shown much love, and in the other half, we've replaced floorboards with cotto tiles. Tiles are all bought and about to be laid so we are committed to them. Now, our geometre (and this is a common theme it seems) has suddenly remembered to mention that we need to pay for finishing etc to the cotto, and has recommended wax. Thanks to the various threads on here, I don't think wax is a good choice for us - the house is not old, and I don't want the hassle of maintenance. So here's where we are - the geometre is going to clean all the tiles (removing old wax etc from the existing tiles in half the house, and cleaning off building gunk from the other newly laid tiles), and then apply the water sealer. All good so far. We're in discussion with them - read, trying to persuade them - regarding the wax v acrylic finishing/ sealing. My reading (and I'm no expert!) is that following the application of the water sealer, we will need to apply just one synthetic product - and my question is: what are our options? Some products I've seen reference to on here that are available in Italy are the Geal products, the Fila products, or Nord Resine's Nordcotto per Interni. I've done some research on renovating cotto in the UK and came across the product from Tile Doctor called Seal and Go Sealer. This seems to be the kind of product we need at this stage - the website says 'A specially formulated water-based blend of acrylic polymers that provides both a stain resistant surface seal and a durable low-sheen finish eliminating conventional two-step methods. May also be used as a pre-grouting sealer. Allows moisture vapour transmission and is not affected by ultra-violet light'....they also do a version ('Extra') that can be used if efflorescence is a risk, which it is with us as we have no waterproof membrane between the concrete and the cotto. Alas, of course, this is a UK product and we need many, many litres (300 sq m house) - so can someone help 1. confirm we only need to apply an acrylic/ synthetic sealer once the geometre has done his cleaning and water sealer thing (sorry for the lack of technical terminology!); and 2. the product which is most similar to the Tile Doctor product available in Italy, either online or from Leroy Merlin or similar. Thanks for reading this far and I hope the answers anyone can provide will help other brave souls going through this interesting experience here in Italy! Ciao ciao!