There is pluggable tuners that can blind scan with VU, the old non fbc tuner modules, the AVL6222 works fine on my Ultimo4k.
im pretty sure the FBC tuners on some gigablue STB's can also blind scan.
For an e2 device with good blind scan then look at the octagon sf8008 or OS mio4k, both are better than my VU in that regard.