Although its a pain, you should really enter each of the ETP companies separately. This will make life much easier down the road if one of them is spun off, or if you buy shares in one of them directly (in which case you'd consolidate the K-1 from the company you hold with the values ETP provides). It's fine to use the ETP address for all 3; but use the different partnership identifiers (they give the unique codes for each).
As for the line 20Z entries, those are informational. Depending on your tax situation, some or all or none may be relevant to you. For example, I live in a non-conforming state and so use the Bonus Depreciation values to make corrections to my state return. So you don't need to enter them into TT, but you do have to take note of each and see if it impacts the way you fill out your return.
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**Note also, I'm not a Tax Preparer/CPA. Just a volunteer, seasoned, TurboTax user.
Use any advice accordingly!
