7
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To each Christmas tree :

  • Put two $+$, two $-$, and two $×$, to the yellow triangles.
  • in a row, there must be different operators (so between $[2,0,1,7]$ all $3$ operators must appear)
  • $A - B$ means $|A - B|$
  • enter image description here

Both Christmas Tree must contains exactly same set of numbers including the initial numbers. If the left tree contains $[a,b,..,j]$ (including $[2,0,1,7,7]$), the right tree must also contain $[a,b,..,j]$ (including $[2,0,1,8,8]$)

enter image description here

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6
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I think this works nicely

enter image description here

A bit repetitive in the placement however

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