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Hi Team,
Looking for recommendations for reapplying these fallen heavy vertical tiles back on. What type of product, and any preparation needed to the surfaces? Liquid Nails? Tile Adhesive? Assume no tiling experience! 
Welcome to the Bunnings Workshop community @WL. It's wonderful to have you join us, and many thanks for your question about fixing fallen tiles.
That looks like a job for Liquid Nail Landscape. No tiling experience is necessary, just apply the adhesive liberally to the wall and stick the tiles back on. You'll need to support them whilst the glue dries. A few props made from garden stakes would do the job.
There's like no preparation necessary, but if the surface is dusty you might like to scrub it back with a wire brush to remove any loose material.
Please let me know if you have any questions.
Mitchell
