Todd H. wrote:
I'd like to drill into poured concrete basement walls to set some
modest anchors to secure the tops of some freestanding shelving units
against tipping on top of small curious nephews and nieces who might
decide to climb on em.

Anything I should know/avoid? I guess my primary concern would be
opening a water infiltration path, but I'd have to think there are
tons of anchors drilled in other walls behind the finished portion of
the basement?

I assume a hammer drill is the tool of choice for this task?

TIA for any shared experience!

Go UP. Anchor the shelving to the ceiling.