Research the specs of the portable countertop dishwasher online and then measure your glasses from bottom to top and make sure that you have at least 1 inch clearance in the dishwasher from both. You don’t want to find out the hard way that they don’t. My experience with countertop dishwashers leads me to give you the following advice:
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If you already have a dishwasher, then you’re far better off getting an extra 18" or 24" dishwasher installed for just the glasses.
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If you don’t own a dishwasher yet, then you’re far better off getting an 18" or 24" dishwasher installed. Better yet, get two. One for just the glasses. If installation is not an option, get portable 18" or 24" dishwashers instead.
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If you already have a dishwasher, but don’t have the ability to install another one in your kitchen. Get a portable 18" or 24" dishwasher on wheels. As long as you can hook it up to a standard faucet and an electrical outlet, you can wheel it around anywhere. The kitchen, the basement, the laundry room, the garage, the backyard patio deck.
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If all of the options above are exhausted or just not feasible due to space or finances, then by all means get the countertop dishwasher. Feel free to wash the dishes and cutlery in it. Just leave the wine glasses out. Those can go on the bottom rack of the regular dishwasher and possibly the middle one depending on how adjust able it is. But the bottom rack is always best.