none of those are best for travel but may work if you have a home and you leave it setup.
i assume the heated gear bag is out of the question.
For a warming specific option, get the dryguys hot toemales or whatever they call it orange foot shaped thing that sticks in the boot. especially if you drive to the resort you can replug into your car (with an inverter) and the extra minutes plugged in on the drive will keep the heat. additionally if they are stone cold and/or you take them to your stonecold car, you can plug your gloves in the top to hold the heat (they typically dont produce enough heat to overcome a cold car heat loss). be careful looking for the model differences, sometimes the travel model that is cigarette powered is an underpowered version, you are better off getting the full model and an car ac inverter.
you still need to start it right when you wake up for breakfast for it to get warm.
they also dry but typically will take half the night to dry versus other options. depending how much of a budget you are on, these are relatively cheap, so you should get 1 per pair of boots that need to be dried. dont forget extension cord (for 3 sockets) and inverter if you are doing the car option.
if you are looking additionally for drying and warmung where travel is involved, your one device options is to take a look either at hotronics snapdry or the therm ic refresher. the item you posted is similar but is not ski boot specific as you need longer arms and 90 shape at the bottom so the air can reach the toes.
i have the therm ic refresher be sure you get the model with timer. this will dry much faster thsn the orange thing so you can swap it to another pair.
if you have multiple people get multiple pairs and an extension cord with extra sockets. maybe 2 thermics for 3 people is fine for drying. one unit may work for 3 ppl if you're really on top of swapping.
as far as drying techinques you need to experiment and it depends how wet you get, but me personally i put it on a 1 or 2hr cycle when i get in and i check if they are dry after dinner before going to bed. leave it off overnight to reduce wear and then start it up first thing in the morning for warming (not specifically for drying).
for gloves they say they have the hand adapters but i dont think they work well as hanging them within the hvacs airflow. if its going to be that wet ive had more success in just bring extra gloves.
