Spread these ignites

Hi guys,

Can someone please explain to me how does the following interact? Regarding the spread of ignite.

"Abberath's Hooves, Goathide Boots" - When you Kill an Ignited Enemy, inflict an equivalent Ignite on each nearby Enemy

"Berek's Respite, Two-Stone Ring" - When you Kill an Ignited Enemy, inflict an equivalent Ignite on each nearby Enemy

"Ignite Proliferation Support" - Ignites caused by Supported Skills spread to other Enemies within a Radius of (14-20)

"Fan the Flames" Cluster node - Ignites you inflict spread to other Enemies within a Radius of 15

Now for the questions:

"Abberath's Hooves" and "Berek's Respite" - as the text is the same i suppose they don't stack, or am i wrong on this?. So i'm interested in what's the range of "nearby"? Didn't find the answer on the "Distance" wiki page.

"Ignite Proliferation Support" and "Fan the Flames" - use the same text but different numeric values so i suppose you can stack them. but how is it calculated? is it 20+15=35? would that then mean if you use 2 Clusters it would be 20+15+15=50?
Or is it in the end so that you can't stack them and it uses the "larger" value?

BONUS question:

"Berek's Respite, Two-Stone Ring" - When you Kill a Shocked Enemy, inflict an equivalent Shock on each nearby Enemy

If i use "Summon Skitterbots" - Shocking Skitterbot's Aura Shocks Enemies near it

Can i spread the Shocks from the Skitterbots with "Berek's Respite" outside the Aura radius of the Skitterbot?

Thank you and stay safe Exile,

https://pathofexile.fandom.com/wiki/Distance

Maybe thats what you're looking for.
As you can read there nearby could be anything between 12-70 units.

As for Fan the Flames/Ignite Proliferation iirc they dont stack in terms of range.

thank you for your replay deathdrep, but the wiki is not helping with my questions.

As deathdrep pointed out, Ranges do not stack. In case of ignite, only the "biggest" of those ranges will apply.

A thread on Reddit suggests Abberath has a range of 20-25, via ingame trials and errors. If that is true, then Ignite Proliferation should always be lower if not equal in radius than Hooves (14-20 vs 20 at worst)

For Berek's Respite, We know officially its radius is 25 (from 12) since 3.11. This means that, for certain, Berek's Respite will have a greater radius than Ignite Proliferation. It could or could not have a bigger radius than Hooves.

It will also be bigger than Fan the Flames, whose radius is big just as a low-level Ignite Proliferation

As you can see Wikia has some answers if you search further. Not everything is updated at the same time, in every place in it.

BONUS ANSWER

Skitterbots will shock enemies around the shocking skitter. If you kill the enemy shocked by the skitterbot, then Respite will proliferate that Shock to nearby enemies, with a radius of 25 as stated above, as you only need to have the enemy shocked in any possible way in order to proliferate it