Thanks for reaching out. This beautiful pendant comes with 12' of cord and 5' of chain. We can have additional chain sent to you that can be added to give you the 8' extension that you need. Just make a note of that when you place your order. And yes, this fixture will work on a slanted ceiling.

Here's a link to our product page on Houzz -

[Uttermost Galeana Seeded Glass Mini Pendant [(https://www.houzz.com/products/uttermost-21811-galeana-seeded-glass-mini-pendant-lighting-fixture-prvw-vr~99366003?lid=64454737)

We offer competitive pricing, free and fast shipping, no re-stocking fee, and exceptional customer service. Please let me know if you have any additional questions.

Pamela Jaffke, Owner/Designer

Innovations Interior Design & Designer Home Decor

Yes, it will work on a slanted ceiling. The wire is 15' in lenth, but the chain is
only 7". you may order extra lengths of chain.