Looking to make a wood magnetic kitchen knife rack. Would these be strong enough assuming a 2-3mm gap between magnet and blade of a 300g knife?

No, the penetration rate of the neodymium magnet is very low. It is recommended that you use two magnets each location and reduce the interval to 1mm or buy stronger magnets.

need to place on the inside of a 6mm glass window will they hold a 300 gram flat metal butterfly on the outside of the glass

Yes, this magnet can hold 500 gram with 6mm gap.

I've bought a pack, and they are all the same polarity. Can I buy some with the opposite polarity? (I want the magnets to attract each other)

The magnets will be very difficult to get apart from each other if they have opposite polarity. Please try to use a steel part to attract with the magnet.

Manufacturer	Magnetpro
Part number	MR40
Item Weight	190 g
Product Dimensions	4 x 1.35 x 0.5 cm; 190 g
Item model number	ki106
Size	40 x 13.5 x 5 mm
Colour	Bright silver
Material	Neodymium, Stainless Steel
Shape	Rectangular
Item thickness	5 Millimetres
Item Package Quantity	8
Number of Pieces	8
Maximum weight capacity	20 Kilograms
Measurement System	Metrisch
Batteries included?	No
Batteries Required?	No

Magnetpro 8 Pieces Rectangular Magnets 20 KG Force 40 x 13.5 x 5 mm with Countersunk Hole and Capsule, Household and Industrial Magnet with Mounting Screws

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