geoviews | Simple , concise geographical visualization in Python | Data Visualization library

I would like to plot something that resembles a kdeplot using geoviews without actually plotting the contour lines. The geoplot library supports something like this:

How can I make such a plot in geoviews?

Here is a very basic example of the kind of kdeplot I am managing to generate via geoviews, which by default plots the black lines that separates different intensities:

Using the matplotlib backend, is it possible to add a tile basemap such as OSM to a GeoViewsplot, e.g. by somehow calling contextily? Using the Bokeh backend, this is done via gv.tile_sources and then adding it to an overlay but is there a similar function for the mpl backend?

Adding a reproducible example assuming one is switching between backends, and using neighbourhood-level polygon gdfs in EPSG:4326.

What made me initially think adding a basemap was not possible was (1) not defining the WMTS zoom level (causing undecipherable pixelated text to be plotted instead of features), and, after reading James' answer, (2) adding the tiles layer to the layout last, not first, which caused tiles to cover the polygons layers (not an issue on the bokeh backend, but with matplotlib apparently it does matter).

datashader 0.13.0, holoviews 1.14.4, geoviews 1.9.1., bokeh 2.3.2.

I'm trying to recreate a choropleth map with one color mapped to one category in a large GeoDataFrame using Datashader, following this example in the Pipeline page and this as well as this SO, which all differ slightly in their syntax, and all use points as the example, rather than polygons.

Below a small sample of the full dataset.

I would like to use bokeh's TapTool to open a different URL when clicking on each of some holoviews.Polygons. An perfect example of how this works in bokeh is in the bokeh docs for point data. However, when I try to use it in holoviews, it doesn't seem to work. The closest thing I could get to work is this:

I have trouble making a interactive map with PySAL. I want to visualize the dutch 'gemeente' (Municipalities). You can download shape files from the dutch bureau of statistics: https://www.cbs.nl/nl-nl/dossier/nederland-regionaal/geografische-data/wijk-en-buurtkaart-2019

I have a Point with a longitude = -0.050122 and latitude = 52.699185.

When I plot this in Geoviews, this Point is incorrectly displayed:

I created a single row GeoDataFrame with a Points geometry column as follows:

I’m experiencing projection errors following a groupby on geodataframe. Below you will find the libraries that I am using:

I have created geo-dataframe using a combination of geopandas and geoviews. Libraries I'm using are below: