Sorry for the delay.
Thanks for your help Tropicbreeze, Napraforgo and Gardenofeden. U. monanthos seems to be perfect for me. Utricularia leptorhyncha and nivea also seem to be good. U. minutissima 'Gunung Jerai' is much lower than U. minutissima 'Gunung tahan', but unfortunately I can't find it. I found only one person who has it but he is currently not available. Wow, I didn't know that Utriularia can be as low as simmonsii, extraordinary. I am wondering also about: u. delicatula and u. lateriflora.