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it is not at all important if just 2% or 3% low quality websites are back linking. Search do understand these things and doesn't react to this. However, it can really be harmful if the percentage is really high, lets say 20% or more.

Though, you can still get that link removed or Disavowed it though GWT.

Hope this helps.

Disavowing would be a good option in this case.

You just need to tell Google that these links are of thin quality and don't want these to get associated with your website

One this is for sure that they're not at all going outta business.

You may want to touch with them via FB: https://www.facebook.com/SEMrush or

twitter https://twitter.com/semrush

They've been quite active on the both the platform. May be they're not paying attention to general user comments, which is very concerning, but instead of waiting for them to respond to users comments and blogs, you should rather try to contact them via email, or social media. I hope you'll get heard.

Agree with @Patrick,

There is nothing to worry about. Your website is absolutely fine, but remember that your website can't be perfect for 100% user or all search engine. So just try to make it useful and search engine compliant to at least 80%.

Just make sure that you've developed and designed your website for users, not automated systems or search engines. Just try to optimize as many pages as possible, and make sure all important pages are easily accessible, user/ search engine friendly and properly optimized.

All these are just pre-defined automated system which works as per the instructions. So you can't rely 100% on these.

IMO, your canonical tag should be for the filtered products (fixed, tracker etc).

individually all pages have different products. It's like a blog. Blogs main page has links all top 10 or 20 or all the blog posts but they have independent pages as well. So you  should not be worried about plagiarism issue here.

With this change you'll get a boost in ranking for other two three more products (fixed, tracker etc) as well. as they'll have their own dedicated pages.

canonicalizing all the products to single page is not a good idea

Hey!

First off, experts don't use the words like "link building, outreach programms, etc.

There had not been any thing called Link building or outreach programm even before Penguin update, it has always been Link earning, gaining, votes, etc. You should focus on gaining links by posting quality content, on blogs, social media, etc.

If your content will be worth sharing, you'll surely get referrals from other blogger and experts in the same field. so forget about link building or directory submission.

Try focusing on producing meaningful content with supportive facts and case studies

Hope this helps!