I don't think either of the tools you linked to are really what you want. A really good slicker brush would be preferable, and a mustache and leg comb. Use them with a good detangler, either a spray or corn starch as suggested above.
I like to use Pet Silk Silk Serum as a detangler. It is actually a coat dressing, but I use it to give the hair slip when undoing knots.
Jenny, Mimimomo, sells the Madan mustache comb on her site
toplinepet.com A really good comb makes a big difference when carefully undoing knots.
I sell the Doggyman small slicker, which is a favorite of groomers. A pricier choice would be the Les Pooches slicker which you can buy directly from them or at Wayfair. Usually slickers aren't recommended for breeds that don't have an undercoat, but these slickers are gentle.
Work on small sections at a time and always hold the hair so that it isn't tugging the skin.