Whilst the Eero is supposed to manage Wi-Fi interference, if this is very bad, particularly in the 2.4GHz band, then it cannot do anything about it, no router can. The same goes for any router at that point. Other things that may then need to be investigated are its location within your property and the WiFi bands that you use. It is possible that you may also need to purchase additional Eero nodes as it is supposed to operate as part of a mesh system. I can help with any of this. However, I would suggest that you follow my help to find out what the root cause of the problem is, before throwing money at it.
I will PM you a link for a guide of mine on Wi-Fi interference & initially look at the section called "Are you suffering from interference – prove it first". This section includes full details of Wi-Fi analysers that I recommend for Windows, Windows phone, Android and Apple operating systems. However, I have no way of testing the Apple product. Do not worry about interpreting the results, I will do that for you.
Please post the screenshots to me in a PM (to protect your privacy), which I have requested in my guide. No photos please they can be difficult to read as text can get out of focus when zoomed in, from the analyser you are using (also in my attached guide). Please ensure that the analyser window is maximised (if Windows) before taking the screenshots & upload them via the "Insert Photos" button (in a mobile browser it's the picture icon) on the post editor's toolbar with the Size parameter set to Large. If they are too small, I will not be able to read them & although I can enlarge them, this puts the text out of focus.
