Looking to mount 24 panels in portrait mode (2x12) on tiled roof, 45 degree pitch or so, in UK. What are cost-effective mounting systems? Seen the Renusol rail system which is ok in price - are there others that are simpler/cheaper/easier? Renusol has angled brackets that screw into the rafters and angle out over one tile and below another, with the rail bolting to it. This approach seems the only way for tiled roofs, but are there other systems that are cheaper? Good Alibaba suppliers for the same stuff also welcomed.