Reddit reviews Whiteside Router Bits UD2102 Up/Down Cut Spiral Bit with Solid Carbide Compression and 1/4-Inch Cutting Diameter
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UD2102Up/Down Cut SpiralIndustrial Quality1-inch Cutting Length 1/4-inch shank 1 Flute
An upcut bit can cause tear out on whichever side you plunge into first, so routing from the back side seems to make sense. Any normal technique to prevent tear out applies.... tape, sacrificial layer.
There are also compression spiral bits which solve the issue. I have one of these: https://www.amazon.com/gp/aw/d/B0012K5YDK?psc=1&ref=yo_pop_mb_pd_title